Explorer coolant pump vs. SN95 coolant pump?

[ntsqd]

I *think* in this thread: https://classicbroncos.com/forums/threads/serpentine-set-up.330985/ it was established that the only (?) difference between these two is the hub for the fan and/or pulley and a minor difference in the machining of the pump body casting. That causes me to wonder if the SN95 pump pulley would align with the Explorer system? In other words if you were running an electric fan or had a correct rotation bolt-on fan that you wanted to keep using could the SN95 coolant pump be used in an otherwise all Explorer front dress?
Part of the reason for asking this question is that not all of the premium coolant pump mfgr's offer an Explorer pump, but some do offer an SN95 pump.

 

[Viperwolf1]

The big difference is the explorer pump shaft is threaded at the end for the fan to attach. Mustang pump is not because it used an electric fan. Pulley flanges may have some differences in bolt pattern and/or offset.

 

[ntsqd]

I had guessed as much, but what I wonder about is could the SN95 pump and and the SN95 pump pulley be used in an otherwise all Explorer system? Is the SN95 pulley, when bolted to an SN95 pump aligned with the Explorer pulleys?

 

[EPB72]

From what I remember the 94-95 mustang wp flange is about 3/4 inch difference then the explorer .

 

[ntsqd]

Speculatively that means that since the SN95 balancer uses a bolt-on pulley that the SN95 pump & pulley may align with the Explorer's on-the-balancer drive pulley. Or at least be very close to doing so.

 

[dmoses42]

I just looked at Rockauto. 1994 Mustang 5.0 GMB water pump 1251920 shows a hub height of 4.120 inches. 1998 Explorer 5.0 GMB water pump 1251960 shows a hub height of 3.290 inches. And looking at the pics, the Explorer pump looks shorter from the timing cover flange to the outside of the pulley mounting hub. I don't think it would work.

 

[ntsqd]

But you're missing the important part, the SN95 pulley. Where is it relative to the gasket surface? I strongly doubt that the Explorer pulley is going to fit on the SN95 hub since we know that they're very different in other aspects. I didn't see an SN pulley listed in the RA applications that I looked at.

 

[dmoses42]

Ok, I see. I just looked at some SN95 pulleys on Ebay, and it appears, like you say, that might work, if using electric fans. There is a used one on there that has the paint wore off from the belt, looks like it might work

 

[ntsqd]

I don't know how desirable doing this might be, but I thought that broadening our knowledge about these things would be worth looking into.

 

[nvrstuk]

I think it's a great idea to be able to see if we can use that set up with an electric fan.

I have some things I'm looking at doing here this winter, and that would be the ideal setup.

They'll make mustang stuff forever, but I can see explorer stuff being phased out eventually. My rationale is, I can buy the Mustang stuff here in town and the Exploder stuff I have to order.

 

[dmoses42]

Just a small side track, but I saw this last night. Says it works with Explorer front dress, and while I would have to have some serious cooling issues to spend this much on an electric fan, it looks like a good option if someone needs one:

https://bcbroncos.com/shop/engine/engine-small-block/12-52002-21-fantom-fan-kit/

 

[ntsqd]

Just to hijack my own thread; I want a mechanical fan like used on big trucks where they use a mag clutch (like an AC compressor uses) to drive the fan instead of the usual thermo fan clutch. I'd also like to attach the shroud to the engine, not the radiator, and then flexible seal it to the radiator.

 

[Broncobowsher]

I thought the big truck engines used air to lock up the clutch? Didn't know about the A/C style magnetic clutch.

Fairly common lately is computer controlled hydraulic clutch. Looks like a thermo clutch, but has wires going to it. Instead of a bimetalic thermal spring controlling the fluid flow and lockup, the engine computer runs a valve to control the fluid flow and lockup. I started messing around a little and the threads of the one I had were a match for the Explorer water pump.

 

[ntsqd]

I'd expect most big truck stuff probably is air, but the one that I saw used wires not tubing.

 

[ntsqd]

Maybe we just need a variable pitch fan?

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[Otis Campbell]

I'm in the middle of changing my front dress to Explorer from SN95 in order to add AC. I can verify what EPB72 said; there is a difference in offset of the pulley of .5" - .75". The Cobra water pumps were also under driven.

 

[ntsqd]

Is that the location of the pulley or the location of the pulley flange on the coolant pump?

 

[dmoses42]

Fairly common lately is computer controlled hydraulic clutch. Looks like a thermo clutch, but has wires going to it. Instead of a bimetalic thermal spring controlling the fluid flow and lockup, the engine computer runs a valve to control the fluid flow and lockup. I started messing around a little and the threads of the one I had were a match for the Explorer water pump.

There is a thread on here somewhere about the Explorer fan not getting deep enough into the shroud, and someone posted up about the 08-09 Trailblazer having a longer shaft and the same threads as the Explorer. When I started looking at the Trailblazer ones in the junkyard, some were straight thermally controlled, some were thermal-electrically controlled, so that may be the one you found.

 

[Otis Campbell]

Is that the location of the pulley or the location of the pulley flange on the coolant pump?

What I was looking at was the location of the pulley. While I've got both pumps, I can take a few measurements later.

 

[ntsqd]

That would be helpful to know. Pictures of the pumps with their respective pulleys would be even better.